the pins between the spindle and caliper keeps slipping out.they were new at the last pad change.any idea why.the still feel greased.

 

Make sure that the little ears on each end of the pins are popped out of the holes that you slide them into, on both the wheel side and the hub side of the spindle/caliper. They're supposed to keep the pins from migrating too far in either direction.

 

So on the short list of probable causes, wrong part.

 

i don't think mine have those stops.typical autozone crap.

 

If you didn't seat them properly, the stops can not engage the spindle, so they become ineffective.

 

After having owned four Aerostars and having the front brake assembles and calipers disassembled dozens of times, I will admit that I've never had any come out on their own.
That's not to say that I ever did like that design. I like a pin or bolt(s) that you can tighten and not worry about.

 

yes, very very El Cheapo system. However, I've never had any pop out either. Try opening up the whatever you call it thingy so it goes in under tension.

 

All the pins I've worked with have "dimples" at the end on both of the metal sides of the pins and on each end that keep the pins in position.

 

dimples, stops, some people press one end with pliers so the pin will go in easy causing the pressed end to not stop the pin from sliding out. Use a properly sized socket in reverse to push the pins, not a screwdriver!

 

here's the "tool" I use to drive the pins into the caliper

 

the pins are a sandwich with a rubber center and two steel plates with stops.

new pins are normally included with a set of new pads.

 

I usually use a screwdriver to tap out the old pins. I place the tip against the side of the pins as I tap so that it compresses that side enough to get the ear to slip past the spindle body. Then I do it again on the other side. I've never distorted the pins such that the ears are no longer sticking out. And, that's pretty tough steel, so if I squeezed it with a pair of pliers, the rubber between the two pieces will compress before I can distort the ears.

 

My vans don't get a lot of mileage these days so I haven't done brakes in a while.
New pins used to come with pads, but I can't remember if they did the last time I did brakes.
The only ones I've ever seen are the ones with the dimples. I can see where the rubber could get compressed to the point where it would slip out.

 

I still have the original pins that came with my van (built in 1990). They're still pliable and resilient, like the new ones. under normal operations, they should not see any more compression than what's required to push them into the hole between the caliper and spindle.

 

it turned out that i put two of the pins in upside down.i thought they were bigger on the end to hold them in.i guess i didn't notice the pins.thanks.